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The public believes mutton has the therapeutic effect of warming the body, which makes it an ideal food for the colder months. Moreover, sheep are generally fattened up after a summer of voracious eating, making them ideal for meat lovers through the winter.

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Many folk customs favor mutton over beef in part because cattle were once considered more important as a means of production.

在杂填土或松软土层中钻孔时，应在桩位处埋设钢护筒，以起定位、保护孔口、维持水头等作用。其内径应比钻头大100mm，埋入土中不少于（）深。

第二次清孔标准是：孔深达到设计要求，沉渣厚度在（）以内。

钻进过程中如发现排出的泥浆中不断出现气泡或泥浆液面突然下降，这表示有孔壁坍陷迹象，可以采取哪些方式预防或处理孔壁塌陷？